The kinetics of the reversible light-induced phenomena of sputtered amorphous As2Se3

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Abstract
The kinetics of the reversible light-induced changes of the optical and transport properties at room temperature of sputtered amorphous As2Se3 films are presented. It is observed that the evolution of the absorption edge shift (photodarkening effect) of the metastable defect creation process and of the photocurrent decay upon exposure to an intense light take place on completely different time scales. These results show that a hierarchy exists in the appearance of the metastable phenomena. It is concluded that various structural changes probably take place during exposure, with different characteristic times, affecting the optical and the transport properties differently.